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Weibel, R., and M. Heller. "A framework for digital terrain modeling." In Proceedings of the Fourth International Symposium on Spatial Data Handling, 219-229. Zürich, Switzerland: University of Zürich, 1990.
Weibel, R., and M. Heller. "Digital terrain modelling." In Geographical Information Systems, edited by D.  J. Maguire, M.  F. Goodchild and D.  W. Rhind, 269-297. Vol. 1. London: Longman, 1991.